Fei Ren Zai is All Saints Street’s sister series, and the two take place in the same universe. While this is just a promo crossover for All Saints Street’s anime release, the two do canonically intersect sometimes…. (Look closely at the 12th episode of All Saint’s Street, and you may spot some familiar faces in the festival crowd!)
My subs for FRZ S3: https://www.youtube.com/watch?v=QmMtqdSlTuQ&list=PLhd0RUp5vUypZVoXwfaK4U7RW5HKgISBh
My subs for ASS S2: https://www.youtube.com/watch?v=NU4iexbCVZU&list=PLhd0RUp5vUyqGbZCw23GvBriX5zZzc4-1
MAG.MOE - The MAG, The MOE.